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Table 3

Critical process parameters (CPPs) associated with the measurement system for biomedical application.

Coding Critical process parameters (CPPs)
CPP1 Primary magnetic field frequency (kHz)
CPP2 Current intensity (solenoid excitation) (mA)
CPP3 Current intensity (circuit) (mA)
CPP4 Circuit supply voltage (V)
CPP5 Sensor sensitivity (mV / nT)
CPP6 Solenoid dimensions (N/L* ratio) (turns/m)
CPP7 GMI supply voltage (V)
CPP8 Oscillator supply voltage (V)
CPP9 Sensor characteristics (intrinsic noise) (fT/√Hz)
CPP10 AC in the GMI sensor (intensity) (mA)
CPP11 AC frequency of the current in the sensor (oscillator frequency) (MHz)
CPP12 Sensor size (length) (cm)
CPP13 Heterogeneity of sensors (difference in sensitivity) (%)
CPP14 Gradiometer baseline (cm)
CPP15 Voltage stability (voltage source) (%)
CPP16 Signal amplification (circuit) (V/V)
CPP17 Superposition of baseline lengths between sensor centers and solenoid axis (solenoid length %) (cm)
CPP18 Circuit noise (intrinsic noise) (pT)
CPP19 Filter (order)

*N/L = Number of turns per unit length of the solenoid. N = 36 turns, L = 0.07 m.

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